Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Colorimetry (C) (4) Enzyme-Linked Immunosorbent Assay (ELISA) (3) Gas Chromatography/Mass Spectrometry (GC/MS) (1) Headspace Gas Chromatography (GC) (2) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (28) High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS) (2) Inductively Coupled Plasma/Mass Spectrometry (ICP/MS) (12) (-) Inductively Coupled Plasma/Optical Emission Spectrometry (ICP/OES) (3) Refractometer (REF) (1) Spectrophotometry (SP) (3) Sample Type Blood (1) Serum or Plasma (1) Urine (1) Test Area Test Category Test Sub-Category Test Test Name 4190B Silicon, Blood 4190SP Silicon, Serum/Plasma 4190U Silicon, Urine